A device and method for detecting the range of motion of a limb for joint rehabilitation care

Abstract

The application discloses a kind of limb activity detection device and method for joint rehabilitation nursing, it is related to medical instrument technical field.The bottom and controller are included, the side of the bottom is fixed with vertical plate, and the outside of vertical plate is provided with measuring rope take-up and pay-off device.The application is provided with measuring rope take-up and pay-off device and bandaging piece, the end of measuring rope is fixed in the corresponding position of the limb to be measured by bandaging piece, with the activity of joint, measuring rope is pulled, the rotation amount of rotating shaft is recorded using rotary encoder, the length increment of measuring rope is converted to obtain, the distance between fixed point and joint rotation center is measured, and the angle of joint rotation is calculated by controller, without manual positioning protractor, measurement error is reduced, and detection accuracy is improved.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a limb range of motion detection device and method for joint rehabilitation care. Background Technology

[0002] Joint range of motion testing has wide applications in clinical practice and rehabilitation: In orthopedics and trauma rehabilitation, regular measurements can assess the healing process of fractures, dislocations, or ligament injuries, guide training, and prevent joint stiffness; in neurological diseases, joint range of motion quantifies the degree of spasticity and the risk of secondary contractures after stroke and spinal cord injury; in rheumatology and immunology, progressive decline in joint range of motion is used as an indicator of activity and treatment efficacy in rheumatoid arthritis and osteoarthritis; in sports medicine, abnormal joint range of motion is used to predict the risk of injuries such as throwing shoulder and runner's knee and to guide flexibility training; in addition, the degree of loss of joint range of motion is a legal indicator for the assessment of disability levels in work-related injuries and traffic accidents.

[0003] In existing technologies, joint range of motion is generally measured using a mechanical goniometer. The operator manually aligns the center point of the goniometer with the center of joint rotation, places both arms along the long axis of the limb being measured, and reads the angle to obtain the range of motion. This method relies entirely on manual positioning and reading, resulting in significant differences between operators and high error rates even when the same operator performs repeated measurements.

[0004] For example, Chinese invention patent application CN112603322A discloses a limb muscle function assessment device, including a mechanical part, a control circuit part, and upper computer software. The mechanical part includes three components: an angle detection module, a muscle pressure measurement module, and a muscle resistance module. It can be used to measure overall muscle function, including joint range of motion, muscle contraction ability, muscle elasticity, and muscle extension ability. It has the advantages of comprehensive evaluation function, fast response speed, high adaptability, and easy mobility. In this technology, the angle between the front connecting plate one and the rear connecting plate two is measured by an angle sensor to obtain the range of motion of the elbow joint. In practical applications, the assessment of joint range of motion may also involve the detection of elbow joint range of motion and shoulder joint range of motion. The geometric configuration of the existing assessment device determines that the device can only measure the joint angle in a single plane of rotation. For ball-and-socket joints such as the shoulder joint, its movement involves multiple degrees of freedom. An angle sensor with a single hinge axis cannot simultaneously measure the complex movement of the shoulder joint in three-dimensional space. Summary of the Invention

[0005] The purpose of this invention is to provide a limb range of motion detection device and method for joint rehabilitation care, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a limb range of motion detection device for joint rehabilitation care, comprising a base and a controller, wherein a vertical plate is fixed on one side of the base, and a measuring rope winding and unwinding device is provided on the outer side of the vertical plate;

[0007] The measuring rope winding and unwinding device includes a housing and a side cover. The side cover is arched and protruding. An automatic rope winder is fixed to the bottom wall of the inner cavity of the housing. The measuring rope is wound up in the automatic rope winder. The measuring rope has a scale on its body.

[0008] A rotating shaft is movably connected inside the housing. Tensioning shafts are provided at the top and bottom of the rotating shaft, and the two tensioning shafts are located on the same side of the rotating shaft.

[0009] A rotary encoder is installed on the outside of the housing, and the input shaft of the rotary encoder is connected to the rotating shaft;

[0010] The measuring rope is wound around the bottom tensioning shaft, then wound upwards to the rotating shaft, then wound upwards to the top tensioning shaft, and finally exits from the outlet opened at the top of the housing;

[0011] The end of the measuring rope that extends out of the shell is connected to a binding device.

[0012] Furthermore, the binding component includes a base plate, and two binding straps are fixed to the top of the base plate;

[0013] When measuring shoulder joint range of motion, the upper arm is secured with a strap. After securing, the measuring rope is positioned on the inside of the arm.

[0014] Furthermore, a vertical groove is provided on the top of the upright plate, and a connecting shaft is provided in the vertical groove. A placement plate is movably connected through the connecting shaft. A support plate is fixed at the bottom of the vertical groove to support the placement plate. After the support plate supports the placement plate, the top surface of the placement plate is parallel to the ground.

[0015] The vertical downward projection of the placement plate is located on one side of the measuring rope that passes through the housing.

[0016] Furthermore, the inner side of the upright plate is provided with a receiving groove, in which the plate is stored.

[0017] Furthermore, a lifting platform is provided on the top of the upright plate. The lifting platform is driven by a drive component to move vertically to adjust the vertical position of the person being tested.

[0018] Furthermore, the top of the placement plate is provided with an elbow joint placement recess.

[0019] Furthermore, a limiting ring is fixed to the top of the placement plate, and an airbag is fixed to the top of the inner side of the limiting ring. The airbag is connected to a micro air pump through an air tube. After inflation, the airbag presses against the upper arm of the subject to achieve the limitation of the upper arm.

[0020] A method for detecting limb range of motion in joint rehabilitation care, using the aforementioned limb range of motion detection device, includes a method for detecting shoulder joint range of motion and a method for detecting elbow joint range of motion.

[0021] The method for detecting shoulder joint range of motion includes:

[0022] S1. The subject stands on the top of the lifting platform with his / her arms hanging naturally on the outside of the upright plate. The height of the lifting platform is controlled by the controller until the subject's palm is on the outside of the side cover. The subject's lateral position is adjusted so that the subject's palm contacts the side cover.

[0023] S2. Keep the measuring rope perpendicular to the ground, pull the measuring rope, then fix the binding to the upper arm of the subject's arm, and finally measure the distance between the shoulder joint and the binding, and read or measure the length of the stretched measuring rope.

[0024] S3. When measuring the abduction range of motion of the shoulder joint, the controller sets the current position of the rotary encoder to zero. The subject raises the arm to the side to the maximum angle and stops. After holding for a set time, the rotary encoder records the rotation of the shaft. The increase in the length of the stretched measuring rope is obtained by converting the rotation amount. The distance between the shoulder joint and the binding and the length of the stretched measuring rope are input into the controller. The controller calculates the abduction range of motion of the shoulder joint.

[0025] S4. The arm of the person being tested is reset, and the measuring rope is also reset under the winding force of the automatic rope winder.

[0026] S5. When measuring the range of motion of the shoulder joint flexion or extension, the controller sets the current position of the rotary encoder to zero. The subject raises the arm forward or backward to the maximum angle and stops. After holding for a set time, the rotary encoder records the rotation of the shaft. The increase in the length of the stretched measuring rope is calculated by converting the rotation amount. The distance between the shoulder joint and the binding and the length of the stretched measuring rope are input into the controller. The controller calculates the range of motion of the shoulder joint flexion or extension.

[0027] The method for detecting the range of motion of the elbow joint includes:

[0028] P1. The subject passes his arm through the limiting ring and places his elbow on top of the elbow joint placement socket, keeping his upper arm in contact with the placement plate. The micro air pump is started until the inflated airbag presses against the subject's upper arm to limit the movement of the upper arm.

[0029] P2. Pull the measuring rope to fix the binding piece to the forearm of the subject's arm. At this time, the measuring rope is located on the side of the arm. Measure or read the length of the stretched measuring rope, measure the distance between the elbow joint and the binding piece, and measure the distance between the elbow joint and the rope hole on the top of the housing.

[0030] P3. The controller sets the current position of the rotary encoder to zero. The subject bends his arm to the maximum angle and stops. After holding the position for a set time, the rotary encoder records the rotation of the shaft. The rotation amount is used to calculate the increase in the length of the stretched measuring rope. The length of the stretched measuring rope, the distance between the elbow joint and the binding piece, and the distance between the elbow joint and the rope hole on the top of the housing are input into the controller. The controller calculates the elbow joint flexion range of motion.

[0031] Compared with the prior art, the beneficial effects of the present invention are:

[0032] This limb range of motion testing device and method for joint rehabilitation care includes a measuring rope winding and unwinding device and a binding device. The binding device fixes the end of the measuring rope to the corresponding position of the limb to be tested. As the joint moves, the measuring rope is pulled. A rotary encoder records the rotation of the shaft and calculates the increase in the length of the measuring rope pulled out. Combined with the measured distance between the fixed point and the joint rotation center, the controller calculates the angle of joint rotation. This eliminates the need for a manual protractor, reducing measurement errors and improving detection accuracy.

[0033] In addition, the device can measure the range of motion of the shoulder joint in multiple directions and the range of motion of the elbow joint, adapting to the measurement needs of different joints. It does not require changing the detection device, is easy to operate, and can meet the range of motion detection needs of multi-degree-of-freedom joints in different directions of movement. The entire device has a compact structure, is easy to operate, has good repeatability, and has a wider range of applications. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the overall structure of the present invention after the base plate is stored.

[0035] Figure 2 This is a side axial view of the base plate after it has been rotated into place according to the present invention;

[0036] Figure 3 This is an axial view of the other side after the base plate has been rotated into place according to the present invention;

[0037] Figure 4 This is a top view of the base plate after it has been rotated into place according to the present invention;

[0038] Figure 5 This is an exploded view of the measuring rope winding and unwinding device of the present invention;

[0039] Figure 6This is a schematic diagram showing the arm position during the measurement of shoulder joint range of motion according to the present invention;

[0040] Figure 7 This is a schematic diagram illustrating the measurement of shoulder joint abduction range of motion according to the present invention.

[0041] Figure 8 This is a schematic diagram illustrating the measurement of shoulder joint flexion and extension range of motion according to the present invention.

[0042] Figure 9 This is a schematic diagram showing the arm position during the measurement of elbow joint range of motion according to the present invention.

[0043] Figure 10 This is a first schematic diagram of the present invention for measuring elbow joint flexion range of motion;

[0044] Figure 11 This is a second schematic diagram illustrating the measurement of elbow joint flexion range of motion according to the present invention.

[0045] In the diagram: 1. Base; 2. Vertical plate; 3. Measuring rope winding and unwinding device; 301. Housing; 302. Side cover; 303. Rotating shaft; 304. Tensioning shaft; 305. Automatic rope winder; 306. Measuring rope; 307. Rotary encoder; 4. Lifting platform; 5. Binding component; 501. Base plate; 502. Binding strap; 601. Placement plate; 602. Support plate; 603. Receiving groove; 604. Elbow joint placement socket; 605. Limiting ring; 606. Airbag; 7. Handle; 8. Shoulder joint; 9. Elbow joint. Detailed Implementation

[0046] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] like Figures 1-11 As shown, the present invention provides a technical solution: a limb range of motion detection device for joint rehabilitation care, including a base 1 and a controller. A vertical plate 2 is fixed on one side of the base 1. The controller can be installed on one side of the vertical plate 2 or is handheld. The controller is equipped with an operation screen that can input parameters and display test results. A measuring rope winding and unwinding device 3 is provided on the outside of the vertical plate 2.

[0048] like Figure 2 and Figure 5As shown, the measuring rope winding device 3 includes a housing 301 and a side cover 302. The housing 301 is a rectangular box, and its back is fixed to the outer wall of the upright plate 2 by bolts. The side cover 302 has an arched protrusion structure and is detachably installed on the opening side of the housing 301 by screws. The internal space of the housing 301 provides sufficient installation space for the measuring rope 306 and its corresponding components. An automatic rope winder 305 is fixed to the bottom wall of the inner cavity of the housing 301. The automatic rope winder 305 can adopt the internal structure of a commercially available steel tape measure, that is, a reel driven by a planar spiral spring. The measuring rope 306 is wound in the automatic rope winder 305 and automatically rewinds when there is no external force stretching. The measuring rope 306 is made of high-strength flexible fiber rope, and its surface is printed with precise graduations along the length direction. The minimum graduation value is preferably 1mm, which makes it easy for the inspector to manually read the length of the measuring rope 306 stretched from the housing 301.

[0049] A rotating shaft 303 is movably connected to the housing 301 via bearings. The rotating shaft 303 is horizontally arranged, and tensioning shafts 304 are provided at both the top and bottom of the rotating shaft 303. The two tensioning shafts 304 are located on the same side of the rotating shaft 303. Each tensioning shaft 304 can be fixed to the inner wall of the housing 301 or movably connected to the housing 301. An annular groove is machined on the outer circumferential surface of the tensioning shaft 304 to accommodate and guide the measuring rope 306 and prevent it from slipping laterally. A rotary encoder 307 electrically connected to the controller is fixedly installed on the outside of the housing 301. The input shaft of the rotary encoder 307 is coaxially fixedly connected to one end of the rotating shaft 303 via a coupling. The rotary encoder 307 is preferably an incremental photoelectric encoder with a pulse count of not less than 1000 per revolution, or an absolute encoder can be used to accurately measure the rotation angle of the rotating shaft 303 and rotate it. Instead of transmitting electrical signals to the controller, in this scheme, the winding path of the measuring rope 306 is as follows: After the measuring rope 306 is led out from the automatic rope winder 305, it first goes down around the lower edge of the bottom tensioning shaft 304, then goes up around the upper edge of the rotating shaft 303, then goes up around the upper edge of the top tensioning shaft 304, and finally passes through the rope hole opened at the top of the housing 301. This winding method makes the measuring rope 306 form an S-shaped wrap angle between the three shafts, increasing the contact friction with the rotating shaft 303, ensuring that the linear motion of the measuring rope 306 can be converted into the rotational motion of the rotating shaft 303 without slippage. Of course, an automatic rope winder 305 with a large winding force can be selected according to actual needs to prevent the measuring rope 306 from slipping on the surface of the rotating shaft 303 when it is pulled out. The end of the measuring rope 306 that passes through the housing 301 is connected to a binding piece 5, such as... Figure 3As shown, the binding device 5 includes a base plate 501 made of plastic or lightweight metal sheet, with two binding straps 502 fixed to its top. The binding straps 502 can be arranged in a crisscross pattern to fix the subject's limb, or the subject's limb can be fixed by Velcro. When measuring shoulder joint range of motion, after fixation, the measuring rope 306 is located on the inner side of the arm (i.e., the side closer to the torso). This ensures that the stretching direction of the measuring rope 306 is basically consistent with the direction of arm movement, reducing deflection error. A schematic diagram of the binding strap 502 after fixation is shown below. Figure 6 As shown.

[0050] To test the range of motion of the elbow joint, such as Figures 1-3 As shown, a vertical groove is provided at the top of the upright plate 2, and a connecting shaft is installed in the vertical groove. A placement plate 601 is movably connected to the vertical groove via the connecting shaft. A support plate 602 is fixed at the bottom of the vertical groove to support the placement plate 601. When the placement plate 601 rotates counterclockwise around the connecting shaft to a horizontal position, the upper surface of the support plate 602 abuts against the bottom surface of the placement plate 601, keeping the placement plate 601 horizontal. At this time, the top surface of the placement plate 601 is parallel to the ground, used to place the arm of the person being tested. Figure 4 As shown, the vertical downward projection of the placement plate 601 is located on one side of the measuring rope 306 that protrudes from the housing 301. That is, the placement plate 601 and the measuring rope 306 are offset from each other in the horizontal projection to avoid interference. Figure 9 As shown, when testing the right elbow joint, the measuring rope 306 is located on the inside of the arm. Similarly, when testing the left elbow joint, the measuring rope 306 is located on the outside of the arm. The inner side of the upright plate 2 is provided with a receiving groove 603, and the placement plate 601 is rotated and stored in the receiving groove 603 when not in use.

[0051] The top of the upright plate 2 is also equipped with a lifting platform 4. The lifting platform 4 is driven vertically by a drive component such as an electric push rod, a lead screw motor, or a pneumatic lifting column to adjust the vertical position of the subject. The drive component is connected to a controller, and the operator can control the raising or lowering of the lifting platform 4 through the buttons on the controller panel. The top surface of the lifting platform 4 is covered with an anti-slip mat for the subject to stand or sit on a chair placed on the lifting platform 4. The top of the placement plate 601 has an elbow joint placement recess 604, which is a downwardly recessed arc-shaped groove whose shape matches the posterior contour of the human elbow joint. It is used to stably support the elbow joint when measuring the range of motion of the elbow joint. A limiting ring 605 is also fixed at the top of the plate 601. The limiting ring 605 is circular and its opening faces the test subject. An air bladder 606 is fixed at the top of the inner side of the limiting ring 605. The air bladder 606 is connected to a micro air pump through an air tube. After the micro air pump is started by the controller, it inflates the air bladder 606. The inflated air bladder 606 expands and presses down on the test subject's upper arm to achieve reliable limiting of the upper arm and prevent the upper arm from lifting off the plate 601 during elbow flexion measurement. In addition, during the test, after the test subject's arm is limited by the air bladder 606, the test subject's other hand can hold the handle 7 installed on the side of the upright plate 2 to ensure body stability.

[0052] The specific detection methods using the above-mentioned limb range of motion detection devices include methods for detecting shoulder joint range of motion and methods for detecting elbow joint range of motion.

[0053] Among them, such as Figures 6-8 As shown, where Figure 6 The p direction in the diagram represents the shoulder joint abduction direction, and q represents the shoulder joint flexion and extension directions. Specific methods for detecting shoulder joint range of motion include:

[0054] S1. The subject stands on top of the lifting platform 4 with their arms hanging naturally on the outside of the upright plate 2. The operator controls the height of the lifting platform 4 through the controller until the subject's palm is on the outside of the side cover 302 (i.e., the palm is roughly level with or slightly beyond the arched protrusion of the side cover 302). Then, the subject's lateral position is adjusted so that the subject's palm contacts the side cover 302. The purpose of this step is to determine the subject's initial position so that the subsequent stretching direction of the measuring rope 306 is basically parallel to the plane of arm movement, and to make the connection line between the center point of the shoulder joint 8 and the binding piece 5 collinear with the measuring rope 306 as much as possible, so that the measurement error is within a reasonable range.

[0055] S2. With the measuring rope 306 perpendicular to the ground, the operator pulls the measuring rope 306 and then fixes the binding piece 5 to the upper arm of the person being tested. The fixing position should be selected in the middle of the upper arm, avoiding the elbow joint and armpit. The tightness of the binding should be such that it does not slip and does not cause discomfort. After fixing, the operator measures the distance a1 between the shoulder joint 8 and the binding piece 5, and at the same time reads or measures the length b1 of the stretched measuring rope 306, and records the above two length values.

[0056] S3, such as Figure 7 As shown, when measuring the shoulder joint abduction range of motion, the controller sets the current position of the rotary encoder 307 to zero. The subject raises their arm to the side to the maximum angle and stops, holding the position for a set time (e.g., 5-10 seconds). During this time, the measuring rope 306 is further pulled out, causing the rotating shaft 303 to rotate. The rotary encoder 307 records the rotation of the rotating shaft 303. The increment of the stretched measuring rope length c1 is calculated from the rotation amount. Finally, the distance a1 between the shoulder joint 8 and the binding 5 and the length b1 of the stretched measuring rope 306 are input into the controller. The controller calculates the shoulder joint abduction range of motion A1. The specific calculation can be completed using the cosine theorem or a pre-calibrated fitting formula. For example, when using the cosine theorem: The angle of A1 is calculated and output, and this angle is set as the shoulder joint abduction range of motion.

[0057] S4. The arm of the person being tested is reset. At this time, the measuring rope 306 is also reset under the winding force of the automatic rope winder 305, and the device returns to the test state without the need for manual adjustment of the measuring rope 306.

[0058] S5. When measuring the range of motion of the shoulder joint flexion or extension, the controller sets the current position of the rotary encoder 307 to zero. The subject raises their arm forward or backward to the maximum angle and stops. After holding the position for a set time, the rotary encoder 307 records the rotation of the shaft 303. The increase in the length of the stretched measuring rope is calculated from the rotation amount. The distance between the shoulder joint 8 and the binding 5 and the length of the stretched measuring rope 306 are input into the controller. The controller calculates the range of motion of the shoulder joint flexion or extension, and refers to... Figure 8The measurement of shoulder joint extension range of motion involves the subject raising their arm to its maximum angle and holding it for 5-10 seconds. The rotary encoder 307 records the rotation of the shaft 303. The increase in the length of the extended measuring rope, c2, is calculated from the rotation. The distance a1 between the shoulder joint 8 and the binding 5 and the length b1 of the extended measuring rope 306 are input into the controller. The controller calculates or uses a pre-calibrated fitting formula to obtain the shoulder joint extension range of motion A2 and outputs the angle. Similarly, the shoulder joint flexion range of motion can be measured, which will not be elaborated in this solution.

[0059] like Figures 9-11 As shown, the methods for detecting elbow joint range of motion include:

[0060] P1. The subject passes his arm through the limiting ring 605 and places his elbow joint 9 on top of the elbow joint placement socket 604, while keeping his upper arm in contact with the placement plate 601. The operator starts the micro air pump through the controller to inflate the airbag 606 until the inflated airbag 606 expands and presses against the subject's upper arm, thus achieving reliable limiting of the upper arm. The inflation pressure can be controlled by preset air pressure threshold or by visually observing the degree of inflation of the airbag 606, so as to prevent both pain and movement of the upper arm.

[0061] P2. The operator pulls the measuring rope 306 to fix the binding piece 5 on the forearm of the person being tested. The preferred fixing position is near the wrist of the forearm. At this time, the measuring rope 306 is located on the side of the arm. Measure or read the length e1 of the stretched measuring rope 306, measure the distance h1 between the elbow joint 9 and the binding piece 5, and measure the distance i1 between the elbow joint 9 and the rope hole at the top of the housing 301.

[0062] P3. The controller sets the current position of the rotary encoder 307 to zero. The subject bends his arm to the maximum angle and stops, holding for a set time (e.g., 5-10 seconds). The rotary encoder 307 records the rotation of the shaft 303. The increase in the length of the stretched measuring rope is calculated by converting the rotation amount. The length of the stretched measuring rope 306, the distance between the elbow joint 9 and the binding piece 5, and the distance between the elbow joint 9 and the rope hole at the top of the housing 301 are input into the controller. The controller calculates the elbow joint flexion range of motion.

[0063] Specifically, in this solution, such as Figure 10 and Figure 11 As shown, the controller calculates the elbow flexion range of motion as follows: Let the elbow joint position be point O1, the rope hole position be point O2, and the position of the binding piece 5 when the measuring rope length increment is maximum be point P. Since the positions of points O1 and O2 are fixed, when O2-P reaches its maximum value, the elbow flexion range of motion C4 when the forearm is located at O1-P can be pre-calculated and this angle can be output. Figure 10As shown, when the forearm gradually flexes from the initial state towards O1-P, let the position of the binding piece 5 be point N. The increase in the length of the stretched measuring rope, g1, is calculated by converting the rotation amount. The length e1 of the stretched measuring rope 306, the distance h1 between the elbow joint 9 and the binding piece 5, and the distance i1 between the elbow joint 9 and the top rope hole of the housing 301 are measured or read. The length e1 of the stretched measuring rope 306, the distance h1 between the elbow joint 9 and the binding piece 5, and the distance i1 between the elbow joint 9 and the top rope hole of the housing 301 are input into the controller. The controller calculates the elbow joint flexion range of motion, B3, where B3 = B1 - B2. The values ​​of B1 and B2 are calculated using the cosine theorem or a pre-calibrated fitting formula, which will not be elaborated further. Figure 11 As shown, when the forearm is far from O1-P, if the position of the binding piece 5 is point M, the measurement rope length increment f1 is measured. The length e1 of the stretched measurement rope 306, the distance h1 between the elbow joint 9 and the binding piece 5, and the distance i1 between the elbow joint 9 and the rope hole at the top of the housing 301 are input into the controller. The elbow joint flexion range of motion C3 = 360° - C1 - C2 is calculated by the controller. Similarly, the values ​​of C1 and C2 are obtained by using the cosine theorem or a pre-calibrated fitting formula, which will not be elaborated further.

[0064] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended embodiments and their equivalents.

Claims

1. A limb range of motion detection device for joint rehabilitation care, comprising a base (1) and a controller, characterized in that: A vertical plate (2) is fixed on one side of the base (1), and a measuring rope winding and unwinding device (3) is provided on the outside of the vertical plate (2). The measuring rope winding and unwinding device (3) includes a housing (301) and a side cover (302). The side cover (302) is arched and protruding. An automatic rope winder (305) is fixed on the bottom wall of the inner cavity of the housing (301). The measuring rope (306) is wound in the automatic rope winder (305). The measuring rope (306) has a scale on its body. A rotating shaft (303) is movably connected inside the housing (301). Tensioning shafts (304) are provided at the top and bottom of the rotating shaft (303), and the two tensioning shafts (304) are located on the same side of the rotating shaft (303). A rotary encoder (307) is provided on the outside of the housing (301), and the input shaft of the rotary encoder (307) is connected to the rotating shaft (303); The measuring rope (306) is wound around the bottom tensioning shaft (304), then wound upwards to the rotating shaft (303), then wound upwards to the top tensioning shaft (304), and finally passes out from the outlet opened at the top of the housing (301); The measuring rope (306) that passes through the housing (301) is connected to a binding piece (5) at its end.

2. The limb range of motion detection device for joint rehabilitation care according to claim 1, characterized in that: The binding member (5) includes a base plate (501), and two binding straps (502) are fixed to the top of the base plate (501). When measuring shoulder joint range of motion, the upper arm is tied and fixed with a strap (502). After the fixation is completed, the measuring rope (306) is located on the inside of the arm.

3. The limb range of motion detection device for joint rehabilitation care according to claim 1, characterized in that: The top of the upright plate (2) is provided with a vertical groove, and a connecting shaft is provided in the vertical groove. The placement plate (601) is movably connected through the connecting shaft. A support plate (602) is fixed at the bottom of the vertical groove to support the placement plate (601). After the support plate (602) supports the placement plate (601), the top surface of the placement plate (601) is parallel to the ground. The vertical downward projection of the placement plate (601) is located on one side of the measuring rope (306) that passes through the housing (301).

4. A limb range of motion detection device for joint rehabilitation care according to claim 3, characterized in that: The inner side of the upright plate (2) is provided with a receiving groove (603), and the placement plate (601) is stored in the receiving groove (603).

5. A limb range of motion detection device for joint rehabilitation care according to claim 1, characterized in that: The top of the upright plate (2) is provided with a lifting platform (4), which is driven by a drive component to move vertically to adjust the vertical position of the person being tested.

6. A limb range of motion detection device for joint rehabilitation care according to claim 3, characterized in that: The top of the placement plate (601) is provided with an elbow joint placement recess (604).

7. A limb range of motion detection device for joint rehabilitation care according to claim 3, characterized in that: The top of the placement plate (601) is fixed with a limiting ring (605), and an airbag (606) is fixed on the top of the inner side of the limiting ring (605). The airbag (606) is connected to a micro air pump through an air tube. After inflation, the airbag (606) presses against the upper arm of the subject to achieve the limitation of the upper arm.

8. A method for detecting limb range of motion in joint rehabilitation care, using the limb range of motion detection device according to any one of claims 1-7, including a method for detecting shoulder joint range of motion and a method for detecting elbow joint range of motion.

9. A method for detecting limb range of motion for joint rehabilitation nursing according to claim 8, characterized in that, The method for detecting shoulder joint range of motion includes: S1. The subject stands on the top of the lifting platform (4) with his arms hanging naturally on the outside of the upright plate (2). The height of the lifting platform (4) is controlled by the controller until the subject's palm is on the outside of the side cover (302). The subject's lateral position is adjusted so that the subject's palm contacts the side cover (302). S2. Keep the measuring rope (306) perpendicular to the ground, pull the measuring rope (306), then fix the binding piece (5) to the upper arm of the subject's arm, and finally measure the distance between the shoulder joint (8) and the binding piece (5), and read or measure the length of the stretched measuring rope (306). S3. When measuring the abduction range of motion of the shoulder joint, the controller sets the current position of the rotary encoder (307) to zero. The subject raises the arm to the side to the maximum angle and stops. After holding for a set time, the rotary encoder (307) records the rotation of the shaft (303). The increase in the length of the stretched measuring rope is obtained by converting the rotation amount. The distance between the shoulder joint (8) and the binding (5) and the length of the stretched measuring rope (306) are input into the controller. The abduction range of motion of the shoulder joint is calculated by the controller. S4. The arm of the person being tested is reset, and at this time the measuring rope (306) is also reset under the winding force of the automatic rope winder (305); S5. When measuring the range of motion of the shoulder joint flexion or extension, the controller sets the current position of the rotary encoder (307) to zero. The subject raises the arm forward or backward to the maximum angle and stops. After holding for a set time, the rotary encoder (307) records the rotation of the shaft (303). The increase in the length of the stretched measuring rope is obtained by converting the rotation amount. The distance between the shoulder joint (8) and the binding (5) and the length of the stretched measuring rope (306) are input into the controller. The range of motion of the shoulder joint flexion or extension is calculated by the controller.

10. A method for detecting limb range of motion in joint rehabilitation care according to claim 8, characterized in that, The method for detecting the range of motion of the elbow joint includes: P1. The subject passes his arm through the limiting ring (605) and places his elbow joint (9) on top of the elbow joint placement socket (604), keeping his upper arm in contact with the placement plate (601). The micro air pump is started until the inflated airbag (606) presses against the subject's upper arm to limit the upper arm. P2. Pull the measuring rope (306) to fix the binding piece (5) on the forearm of the subject's arm. At this time, the measuring rope (306) is located on the side of the arm. Measure or read the length of the stretched measuring rope (306), measure the distance between the elbow joint (9) and the binding piece (5), and measure the distance between the elbow joint (9) and the top rope hole of the housing (301). P3. The controller sets the current position of the rotary encoder (307) to zero. The subject bends his arm to the maximum angle and stops. After holding for a set time, the rotary encoder (307) records the rotation of the shaft (303). The rotation amount is converted to obtain the length increment of the stretched measuring rope. The length of the stretched measuring rope (306), the distance between the elbow joint (9) and the binding piece (5), and the distance between the elbow joint (9) and the rope hole at the top of the housing (301) are input into the controller. The elbow joint flexion range of motion is calculated by the controller.

Images